JPS5924677Y2 - bag - Google Patents

Description

[Detailed description of the invention] This invention forms flaps at both ends of the eaves of the cylindrical case body, in which both side edges of the bag material are overlapped and attached to the body, and these flaps are folded to face the outer wall of the case body. This invention relates to an improvement in a so-called step-cut single-stick bag (pinch bag) in which the bottom and mouth of the bag are closed by pasting the bag to the bottom of the bag.

The above-mentioned step-cut single-stick bags are generally widely used using paper as the main bag material.

However, in conventional bags of this kind, as shown in FIGS. 1 and 2, when the two side edges of the bag material are overlapped and pasted together, the adhesive 3 does not protrude from the side edges of the bag material. In order to do this, by making the width of the adhesive 3 narrower than the overlapping width of the bag materials, a portion a that is not bonded can be created between the side edge of the bag material that is inside the flap 4 and the adhesive 3. Unavoidably, even if the flap 4 is folded to close the bag bottom or bag mouth, the contents such as powder may leak from the open end a' of the portion a as shown by the arrows in FIGS. 1 and 2. There was a problem with leakage outside the bag.

This idea is to form a notch in the overlapping corner of the side edge of the edge of the bag material which is the inside of the flap in the single step cut bag described above, and to form a notch on both sides of the bag material within the width of this notch. By locating the edge body line, the purpose is to solve the above-mentioned problem and prevent the contents from leaking out of the bag.

Examples of this invention will be described below with reference to the drawings.

3 to 5 show an embodiment in which this invention is applied to a single-layer pleated paper bag.

In Figs. 3 to 5, 1 is a packaging body, and this packaging body 1 has pleats 2, 2 on both side edges and overlaps both side edges of the bag material. It is attached with an adhesive 3, that is, the body is attached to form a cylindrical shape, and the ends of the bag material 1 are symmetrically arranged in the front and back, including the pleats 2, 2, in an inward step-like shape. Flap 4 with cut edges;
4, bend one of these and close either the bag opening or the bag bottom of the packaging body 1 with hot melt adhesive 5,
The other flap is adapted to be closed in the same manner as the one flap after the bag has been filled with contents.

The above structure is the same as that of a conventional bag of this type, but a notch 6 is formed at an appropriate time in the side edge overlapping corner of the end of the bag material 4a which is the inner side of the flap 4. Intimidate,
The adhesive 3 for overlapping and bonding both side edges of the bag material is placed within the width W of the notch 6 to perform body bonding.

Therefore, in the bag of this embodiment, when the hot-melt adhesive 5 that closes the bag opening or the bag bottom is applied to the flap 4, this adhesive 5 becomes the inside of the bag with the adhesive 3 for attaching the body. It is also applied to the bag material 4b, which is the outside of the end side of the flap 4, from the open end a' of the part a that is not bonded when pasting the bag material 4a to the side edge of the bag material 4a, and attaches the flap 4 to the end of the main body 1. When the flap is folded along the fold line 7 and pasted with the adhesive 5 applied to the flap, the area around the opening end a' of the part a that is not pasted when pasting the body will be pasted. Unlike the conventional product shown in Figure 2, contents such as powder do not leak.

FIG. 6 shows an embodiment in which this invention is applied to a two-layer bag. In this embodiment, the edges of the inner and outer bag materials 8 and 9 are aligned, and the inner and outer bag materials are cut at an angle of 8° before being cut into steps. 9, except that the mounting body was constructed by conventionally known means such as bonding the parts 9 to each other.
The process is carried out in substantially the same manner as the embodiment shown in FIGS.

That is, in this case, a notch is formed at the corner of the overlapping side edges of the two inner layers of the flap.

FIG. 7 shows another embodiment in which this invention is applied to a two-layer bag. In this embodiment, the side edges of the inner and outer bag materials 8 and 9 are shifted from each other, and the adhesive 3a is applied at two points in the width direction. , 3b, the inner and outer bag materials 8 and 9 were individually attached to the body, but the embodiment is almost the same as the embodiment shown in FIG. 6 and described above, but in this case, at least the inner bag side It is necessary to position the adhesive 3a within the notch width of the flap described above.

In this invention, as the material for the bag, a wide range of paper-based materials can be used, such as paper such as kraft paper, and cloth kraft made of a composite of paper and synthetic resin.

Furthermore, this invention can be applied to single layered, multi-layered, pleated or non-pleated bags as long as the bag is pasted once with step cuts.

In the case of multi-layer bags, conventionally, the positions of the inner and outer bag materials are shifted and each layer is attached to create a multi-layer cylindrical body and a bag that does not leak powder. However, according to this invention, if the inner and outer layers are glued together, there is no need to consider the position of the shell, and contents such as powder can be manufactured without leakage by simple step-cutting in which each layer has the same shape. .

Note that the above-mentioned notch formed in the flap is not limited to the shape of the above-mentioned embodiment, but may be made into an appropriate shape such as a triangular cut (although it is particularly preferable to make this cut with a gentle slope). The width of the notch is only a few mm because, unlike water-soluble adhesives, unlike water-soluble adhesives, the adhesive does not spread even when pressed and can be applied all the way to the edge of the flap. be.

As explained above, according to this invention, by simply forming a notch in the side edge overlapping corner of the inner end of the bag material in the flap, powder in a bag with a single step cut can be removed.
It is possible to prevent the contents such as fine particles from leaking, and since the bag is a step-cut bag, the notches can be formed freely and easily.

Note that although a protrusion protrudes from the edge of the bag material on the opposite side to the side on which the notch is formed, since this protrusion is not on the flap side, there is no problem in manufacturing and using the bag.

[Brief explanation of the drawing]

Figure 1 shows the front view of the pasting of the overlapping part of the bag bottom in the conventional example.
Fig. 2 is a side sectional view of the section taken along the line III in Fig. 1 after the bag bottom is closed; Fig. 3 shows an embodiment of this invention; Figure 4 is an enlarged front view of the pasting of the bag's bottom seam, Figure 5 is a side cross-sectional view of the area lined by ■-■ in Figure 4 after the bag's bottom is closed, and Figures 6 and 7. The figures are cross-sectional views of side edge overlapping portions of bag materials showing another embodiment of this invention. 1... Mounting body, 3. 3a, 3b...
・・Adhesive for the overlapping parts on both sides, 4・・・・Flap, 5・・・・Adhesive for pasting the flap, 6・・・・
・Notch.

Claims (1)

[Scope of utility model registration request] A cylindrical case body is attached to the body by overlapping both side edges of the bag material, and folded flaps are formed at both ends of the eaves, and the flaps are bent and attached to the other side wall of the case body to form the bottom of the bag. and a bag with a closed bag opening, in which a notch is formed at a corner of the inner end of the bag material in the body pasting part of the flap so that the body pasting line is located within the width of the corner. A bag featuring